David Jenkins
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| posted on 29/1/08 at 12:53 PM |
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Trivial fuel pipe question.
I'm busy sorting out the layout of the fuel pipes for my bike carbs, and have come up with a 'cunning plan'. However, it's
dependent on an assumption that I'll try out on you lot.
The 4 carbs come in 2 pairs, with fuel pipes between each pair (1--2, 3--4).
Ideally I bring 2 equal length pipes down from the connections, into a T-piece, then 1 pipe to the regulator.
However, it would be easier if I put a very short pipe on the first connection, then a much longer one to the other. I'm talking about 3"
to the first one, 9" to the second.
Am I right in assuming that this won't make any difference, as long as the capacity of the pump, pipework and regulator can meet the demand for
fuel?
David
 
Rescued attachment pipe1.JPG
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Mr Whippy
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| posted on 29/1/08 at 12:56 PM |
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think of a injection fuel rail, fuel goes into the end.
so long as the feed pipes have a large bore you should have no problems, but I think it will look pants 
Fame is when your old car is plastered all over the internet
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ditchlewis
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| posted on 29/1/08 at 12:57 PM |
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that looks like my twin forty fives. the pipe comes from the pump, first to a t piece conection that feeds the first carb then on to the second
carb.
ditch
[Edited on 29/1/08 by ditchlewis]
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Agriv8
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| posted on 29/1/08 at 01:03 PM |
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Rover V8's run all the injectors in series .
Ie fuel pump resure in at one end and regulator out at the other.
Regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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BenB
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| posted on 29/1/08 at 01:06 PM |
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The pressure within the system should be the same so it's no problems doing it either way.
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RazMan
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| posted on 29/1/08 at 01:11 PM |
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With carbs surely it is more about flow than pressure - as long as you have enough flow then you should get the same at each carb regardless of
plumbing. However if flow is restricted in some way (pinched pipe or knackered pump) then the carb furthest down the line will be starved first.
[Edited on 29-1-08 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Rosco
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| posted on 29/1/08 at 01:11 PM |
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There's a pressure drop associated with any length of pipe, so you will get a slightly difference in fuel pressure. I would have thought this
would be insignificant on such short runs but you could help yourself by using a larger diameter line and/or by making sure that the runs, especially
the longer runs, are a straight as possible.
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Phil.J
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| posted on 29/1/08 at 03:18 PM |
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With carbs you have a buffer in the fuel supply system in the form of the float chamber which can handle small variations in pressure.
As long as the fuel line can flow sufficient fuel for your maximum needs then either layout will be fine.
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David Jenkins
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| posted on 29/1/08 at 06:58 PM |
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That's what I thought - thanks!
BTW: The pipework won't be seen very easily, so I'm not too worried about looks... 
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